Thank you for the site as I forgot I had studied this a long time ago and found this in my notes.
Concerning the word Lucifer the King James took the Latin Vulgate word Lucifer which in Latin means the morning star meaning the planet of Venus. Has nothing to do with Jesus being called bright and morning star in Rev 22:16 as the use of those words are different. Lucifer is considered a Greco-Roman pagan god and has nothing to do with Satan, Devil or what other names this fallen angel is called by.
morning star son of the dawn - NIV
Lucifer son of the morning - NKJV
shinging star of the dawn - James Moffatt
Day star Son of Dawn - The Jerusalem Bible
Lucifer son of the morning - KJV
In the Roman language Lucifer was the name given to the morning star Venus as Venus was considered a pagan god. The morning star appears in the sky just before dawn. In the Hebrew text the expression used to describe the Babylonian king before his death is Helal, son of Shahar, which can be translated as Day star, son of the Dawn. Jerome had mistranslated the Hebraic metaphor Day star, son of the Dawn, as Lucifer, and over the centuries a metamorphosis took place from the Latin in that of interpreting Lucifer into a fallen angel now named Satan. In the original Hebrew day star, son of the dawn is used, but not for that of Satan, but for the king of Babylon. Isaiah is using this metaphor for a bright light, though not the greatest light (Jesus) to illustrate the apparent power of the Babylonian king which then faded.
The name Satan comes from a Hebrew word sah-TAHN which means adversary as in signifying an enemy, and an accuser, father of lies.
Isaiah 14:12-15 Ezekiel 28:14,15 is prophetically directed to the king of Babylon and the king of Tyre, but also meant to include someone apart from humans as being refered to as an anointed cherub or son of the morning that has always been our adversary starting with his fall from God's favor, but still has access to heaven as he presents himself before God to accuse the brethren before Christ, Job 2:1,2; Rev 12:10, until Michael wars against him and kicks him out of heaven with all his unholy angels, Rev 12:7-9. It was Satan (or whatever one wants to call this fallen angel as God never gave him a name that I know of who worked through the serpent who tempted Adam and Eve and also tempted Jesus in Matthew 4:1-11. Some might ask why would God let Satan into the garden already knowing what would happen and the answer is because it was God's will as being our Father knows we will fail at times, but as any parent, wants us to grow from the mistakes we make as we take responsibility for our actions.